This isn't a simple fix like replacing a sensor. It usually points to a deeper issue, and often requires professional diagnosis and repair. Possible causes include:
* Faulty PCM: The PCM itself may be failing. This is the most likely culprit and often requires replacement.
* Power Issues: Intermittent or low voltage to the PCM can corrupt its memory. This could be due to a bad battery, alternator, or wiring problems.
* Software Glitch: A software bug within the PCM's programming (though less common). A reflash of the PCM's software might be attempted, but this is usually only done after other causes are ruled out.
* Physical Damage: Though less likely, physical damage to the PCM from a collision or extreme environmental conditions could cause this error.
It's crucial to have a mechanic diagnose the underlying cause of the P0605 code. Simply clearing the code won't fix the problem; it will likely reappear. The mechanic will need to perform tests to determine why the PCM's memory is corrupted. They might check the power supply to the PCM, inspect its wiring harness, and potentially test the PCM itself.
